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Hasti Daraei Kimia Toolabian Ian Thompson Guanglei Qiu 《Frontiers of Environmental Science & Engineering》2022,16(2):19
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介绍了减压塔规整填料腐蚀的现状,阐述了介质温度、流速、腐蚀介质种类和填料尺寸等因素对规整填料腐蚀的影响,提出了改变工艺、加注缓蚀剂、改变材质和加强腐蚀检测等防护措施。 相似文献
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炉渣与生物炭施加对稻田温室气体排放及其相关微生物影响 总被引:6,自引:0,他引:6
为了减少稻田温室气体排放通量,本研究对稻田土壤进行炉渣和生物炭单一施加和混合施加处理,并测定了早、晚稻拔节期和乳熟期CO_2、CH_4和N_2O排放通量及相关微生物(细菌、真菌、硝化细菌、反硝化细菌)的数量.结果表明,稻田施加废弃物可以减少温室气体的排放通量.在早、晚稻的拔节期,施加生物炭显著降低了CO_2和N_2O的排放通量(p0.05),混合施加显著降低了CO_2和CH_4的排放通量(p0.05),施加炉渣条件下3种温室气体的排放通量与对照组相比没有差异.施加炉渣或生物炭都显著降低硝化细菌的数量(p0.05),混施处理显著降低细菌、硝化细菌、反硝化细菌数量(p0.05),但显著提高了稻田土壤真菌/细菌比值(p0.05).在早、晚稻的乳熟期,炉渣、生物炭、混施处理能显著降低CH_4排放通量(p0.05),而生物炭处理显著降低N_2O排放通量(p0.05).炉渣处理显著降低细菌、硝化细菌、反硝化细菌数量(p0.05),生物炭处理显著降低细菌、反硝化细菌数量(p0.05),混施处理显著降低细菌、硝化细菌数量,并显著提高真菌/细菌比值(p0.05).温室气体排放与微生物数量之间的相关性分析结果表明,CO_2、CH_4排放通量与细菌数量呈显著正相关,与真菌/细菌比值呈显著负相关;而N_2O排放通量则与硝化细菌、反硝化细菌数量呈显著正相关. 相似文献
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采用序批式生物反应器(SBR)处理模拟氨氮废水,考察了SBR体系中硝化过程中氮组分和溶解氧变化规律,并对硝化动力学进行了研究.结果表明,在低溶解氧下,体系出现亚硝态氮积累;在序批式反应体系中的硝化反应呈现三阶段,即零级反应段、混合反应段和一级反应段,其硝化特性符合Monod动力学方程;根据SBR实现选择性硝化过程控制方法,实现了SBR选择性亚硝化启动,该体系氨氮出水1 mg·L~(-1),氨氮负荷达0.45 kg·kg~(-1)·d~(-1)(以每kg MLSS中的NH_4~+-N量(kg)计),亚硝态氮累积率达95%左右. 相似文献
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通过对川东北地区钻完井事故资料的统计,分析了影响高含硫化氢气田钻完井安全的主要风险因素。 相似文献
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"十四五"时期是世界百年未有之大变局的加速演进期、全球百年未遇之大疫情的持续影响期.为促进安全文化建设,提升全民安全文化素质,减少事故的发生,本研究提出了坚持党的全面领导、坚持以人为本、坚持创新发展理念、因企制宜及统一性原则作为安全文化建设遵循的原则.根据安全文化建设"球体斜坡力学原理",建立企业安全文化建设模式.结果表明:企业安全文化建设的引力、推动力和内在动力分别是安全管理单元、形象传播和安全文化宣传单元、以人为本和科技创新;支撑力是管理控制单元和安全文化评价单元;下滑力是人的不安全行为、物的不安全状态、环境的不安全因素和管理的缺陷.研究结果可为企业安全文化建设提供智力支持. 相似文献
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Yong Li Caihong Li Yanhai Zheng Guanglei Wu Tana Wuyun Hong Xu Xinhua He Gaoming Jiang 《环境科学学报(英文版)》2011,23(2):255-265
Combined e ects of ozone (O3) and cadmium (Cd) on growth and physiology of winter wheat (Triticum aestivum L. cv. JM22)
were determined. Wheat plants were grown without or with Cd and exposed to charcoal-filtered air (< 10 ppb O3) or elevated O3
(80 5 ppb, 7 hr/day) for 20 days. Results showed that O3 considerably depressed light saturated net photosynthetic rate (–20%),
stomatal conductance (–33%), chlorophyll content (–33%), and total biomass (–29%) without Cd. The corresponding decreases were
further enhanced by 45%, 56%, 60% and 59%, respectively with Cd, indicating a synergistic e ect of O3 and Cd on wheat. Ozone
significantly increased the activity of superoxide dismutase (46%), catalase (48%) and peroxidase (56%). However, great increases
in malondialdehyde (MDA) content (2.55 folds) and intercellular CO2 concentration (1.13 folds) were noted in O3+Cd treatment
compared to control. Our findings demonstrated that the increased anti-oxidative activities in wheat plants exposed to O3+Cd might
not be enough to overcome the adverse e ects of the combination of both pollutants as evidenced by further increase in MDA content,
which is an important indicator of lipid peroxidation. Precise prediction model on O3 damages to crop should be conducted to ensure
agricultural production security by considering environmental constraints in an agricultural system in peri-urban regions. 相似文献